Valve-gear



(No Model) J. SPENCER. VALVE GEAR No.-514,783. Q Patented Feb. 13, 1894.

w WITNESSES INVENTOH I Mm ATTORNEYS.

UNITED STATES PATENT GFFICE.

JEHIAL SPENCER, OF MILLEDGEVILLE, ILLINOIS.

VALVE-G EAR.

SPEGIEIGATION forming part of Letters Patent No. 514,783, dated February 13, 1894.

Application filed April 26,1893. Serial No. 471,891. (No model.)

To all whom it may concern.-

Be it known that I, JEHIAL SPENCER, of Milledgeville, in the county of Carroll and State of Illinois, haveinvented a new and Improved Valve-Gear, of which the following is 4 a full, clear, and exact description.

The invention relates to valve gear actuated from the pitman of the engine.

The object of the invention is to provide a newand improved valve gear, which is simple and durable in construction, very effective in operation, and arranged to cause the engine to utilize the motive agent to the fullest advantage and to permit of conveniently reversing the engine whenever desired.

The invention consists of a reciprocating slide adapted to be actuated from the engine pitm an, and connected by an arm with a block held to slide in alink and connected with the valve stem.

The invention also consists of certain parts and details, and combinations of the same as will be hereinafter described and then pointed out in the claims.

Reference-is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a side elevation of the improvement as applied, parts of the engine being in section. Fig. 2 is a sectional side elevation of the improvement on the line 22 of Fig. 3. Fig. 3 is a cross section of the same on the line 33 of Fig. 2; and Fig. 4 is a rear elevation of the link.

The engine A, on which the valve gear is applied is of the usual construction, and is provided with a suitably-constructed frame on which is mounted a cylinder B, provided with a piston 0, having its piston rod. D, connected with the cross head E, pivotally-connected by the pitman F, with the crank disk G, attached to themain driving shaft H.

On the pitman F is secured an arm I, pivotally connected with a sliding block J, mounted to slide in a longitudinally-extending slot K formed in the lower end of a slide K, mounted to slide vertically in suitable bearings formed in an auxiliary frame L, attached to the main frame A. The slide K is pivotally connected at its front face by an arm N, with a block 0, mounted to slide in a recess or slot P formed in a link P, provided in its middle with a pivot pin P mounted to turn in a bracket L, secured to the auxiliary frame L.

On the pivot 'P is secured alever Q, adapted to be locked in a notched segment L forming part of the bracket L. The pin 0 connecting the block 0 with the. arm N is also engaged by a link R, pivotally-connected with the stem S of the valve T, mounted to slide in the usual manner in the steam chest U.

The operation is as follows: When the several parts are in the position illustrated in Fig. 1, then the link P stands in an angular position, so that on a reciprocating motion of the slide K the link N will cause the block 0 to slide in the inclined recess or slot P to impart a reciprocating motion to the valve T by the link R and stem S. A reciprocating motion is given to theslide K by the pitman F as the latter is connected by the arm I with the block J sliding in the slot K of the said slide K, so that the latter is reciprocated up and downon each full revolution of the crank disk G on the driving shaft H. Now, when it is desired to reverse the engine, the hand lever Q is moved into a right hand position and again locked to the segment L so that the link P is held in an angular position 0pposite to that shown in Fig. 1. Now, it will be seen that on the reciprocating motion of the slide K, a sliding motion is given to the block 0, but in an opposite direction, so that the valve T is reversed. When it is desired todecrease the throw of the valve T, then the lever Q is moved in an intermediate position on the segment L and if it is desired to stop or reduce the movement of the valve to a minimum to prevent admission of the motive agent to the cylinder, then the said hand lever Q is moved into a vertical position,thus moving the block P in a like position as indicated in Fig. 2.

It will be seen that by this device the ports leading from the steam chest U to the cylinder B are opened to their full extent during the first one-eighth movement of the crank disk Gwhen the wrist pinis at a dead center position, and the ports remain wide open until the wrist pin is near the opposite dead center position. If desired, a governor may be connected with the link P so as to turn the latter automatically on its pivot 1? according to the load of the engine, to cut off sooner or later as the case may be. In this construction the hand lever Q is omitted and the link P is completely controlled from the governor.

As shown in Fig. l, the valve T is hollow and conforms in cross section to the'steam chest, the live motive agent passing directly into the valve for the inlet pipe and through ports in the bottom of the valve to the cylinder ports. The exhaust takes place from the steam chest. Now it will be seen that when the valve is shifting and steam ports in cylinder are partly opened, then the exhaust steam passing to the steam chest will press on the valve and assist in moving it to its place.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent- 1. A valve gear comprising a reciprocating slide adapted to be actuated from the engine pitman, an arm pivotally-connected with the said slide, a block mounted to slide and connected with the said arm and with the valve stem, and a link in which the said block is fitted to slide, substantially as shown and described.

2. A valve gear comprising a reciprocating slide adapted to be actuated from the engine pitman, an arm pivotally-connected with the said slide, a block mounted to slide and connected with the said arm and with the valve stem, a link in which the said block is fitted to slide, and means,substantially as described, for turning the said link, as set forth.

3. Avalve gear comprising a reciprocating slide having a longitudinal slot, a sliding block in the said slot and adapted to be connected with the pitman, an arm pivotally-connected with the said slide, a block pivotallyconnected with the said arm, and adapted to be connected with the valve stem, a block mounted to turn and formed with a groove or slot in which is fitted the said block, and a hand lever for turning the said link, substantially as shown and described.

4. A valve gear comprising a reciprocating slide having a longitudinal slot, a sliding block in the said slot and adapted to be connected with the pitman, an arm pivotally-connected with the said slide, a block pivotallyconnected with the said arm and adapted to be connected with the valve stem, a block mounted to turn and formed with a groove or slot in which is fitted the said block, a hand lever for turning the said link, and a segment adapted to be engaged by the said hand lever for locking the latter in place, substantially as shown and described.

J El-IIAL SPENCER.

Witnesses:

GEO. KELLEY, F. B. MEYERS. 

